ST AN2406 APPLICATION NOTE
AN2406
Application note
TS4962IQ class D audio amplifier
Evaluation board user guidelines
Features
■ TS4962IQ low voltage class D differential audio power amplifier with standby mode
■ Operating range from Vcc=2.4V to 5.5V
■ 2.2W output power @ Vcc=5V, THD=1%, F=1kHz, with 4Ω load
■ 1.4W output power @ Vcc=5V, THD=1%, F=1kHz, with 8Ω load
■ Ultra low power consumption in standby mode (10nA)
■ 63dB PSRR @ 217Hz in grounded mode (Av=2V/V)
■ Low pop & click
■ Fast startup time: 5ms
■ Module gain set at 2V/V
Description
This mono class D demoboard is designed for the TS4962IQ class D audio amplifier. The
TS4962IQ device, in a DFN pac kage, is mounted on a t wo-la y er PCB with t wo po wer pl anes
acting as a heatsink.
Figure 1. shows the schematic diagram of the demoboard.
Figure 1. Schematic diagram of the mono class D demoboard
Vcc
Positive input
Negative Input
Cn1
Input
Cn4
1
2
3
Cn2
C1
100nF
1
2
GND
3
100nF
C2
Cn3
GND
R1
150k
R2
150k
Stdby
1
4
InIn+
3
-
+
300k
150k
150k
C3
1uF
Internal
Bias
Oscillator
GND
PWM
Vcc
Vcc
Output
H
Bridge
GND
7
GND
6
Out+
Out-
U1
5
8
TS4962DFN
Cn6
Gnd
Cn5
Positive Output
Negative Output
Speaker
April 2007 Rev 2 1/5
www.st.com
AN2406
Figure 2. shows the top view of the demoboard PCB, with the markings showing the
connector placements.
Figure 2. Mono class D demoboard - top view
Caution: When you apply the pow er supply throug h Cn6, DO NO T in vert the polarity because it would
destroy the amplifier U1.
Table 1 lists the connectors on the demoboard, with a description for each, and their
configurations.
Table 1. Description of demoboard connectors and their configurations
Connectors Description
Cn1 Input signal connector (active input signal positive and negative)
Cn2 and Cn3
Connectors to modify input configuration (from capacitor-coupled = no jumper to
common mode feedback = short-circuit).
Cn5 Output signal connector (Vo+ and Vo-)
Cn4 Standby control connector (GND, Standby, VCC)
Cn6 Power connector (V
and GND). Power supply voltage from 2.4V to 5.5V.
CC
U1 Class D amplifier TS4962IQ
2/5
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